Method of making metal castings



Se t. 27 192 p -7 H. KLOUMAN METHOD 0F MAKING METAL CASTINGS Filed Sept.18. 1925 L TQ Patented Sept. 27, 1927.

UNITED STATES PATENT OFFICE.

I-IENNING KIOUMAN, OF MICHIGAN CITY, INDIANA, ASSIGNOR IO CHROBALTICTOOL COMPANY, A CORPORATION OF ILLINOIS.

METHOD OF MAKING METAL CASTINGS.

Application filed September 18, 1925.

offset inwardly from the surface of the casting.

The invention consists of the method here* inafter described, and in theaccompanying 10 drawing 'illustrating its employment there is shown inFig. 1, a view in perspective of the carburizing box, some portionsbeing broken away. F ig. 2, a detail vertical section of the mold, coresand the box wall; and

Fig. 3, a view in perspective of an ad- )ustable section of the core andthe metal insert carried thereby.

The article, to the manufacture of which the improved method isapplicable, is shown as a box comprising a cast wall 10, having a sheetmetal panel 11 which is cast into the wall. The drag element 1Q of themold is filled with sand, as represented at 13, within which is formed,by suitable patterns, an impression of the outer surface of the boxwhich is to be molded.

TheA sheet metal panel 11 being set in a short distance from the outerface of the box wall, the sand impression necessarily comprises a boss14 of the contour of the openingl in the casting to be formed, againstthe face of which boss the panel insert 11 must be closely fitted toprevent the metal from flowing over its sury v face.

The mold is completed by the insertion into the cavity in the sand 13 ofa. core 15, having the contour to be given the inner surface of thecasting to be formed. opening is left in the side wall of the core 15 ofa size and shape corresponding to the sheet metal panel which is to beembedded lVithin this opening there is fitted a movable core block 16,to the outer face of which the sheet metal panel 11 is secured, as bymeans of pins 17. The panel is of greater area than the face of the corein the casting.

block to provide marginal sections which will be embedded within thecasting.

Seral No. 57,143.

fore insertion of the core 15 into the cavity 50 of the mold, the block16 is entered into its aperture, the marginal portions of the insert 11being in contact with the outer face of the core 15.

The completed core is now placed Within the mold and the insert 11,being set in beyond the position it is to occupy, will pass the bois 1awithout contact therewith and, coiiiequently, without injury thereto.lThe core 15 being properly positioned, the block 16 is forced outwardlyto bring the insert 11 into Contact with the face of the boss 14, thusmoving its marginal portions awa-y from the outer surface of the core15, its marginal portionsoverlapping the boss. y

The metal being poured in the usual manner, will flow about and envelopthe niarginal portions of the insert and complete the structureillustrated in the drawings. The box comprises a sheet metal panel inits bottom wall, as shown at 18, but this insert is readily placed inthe mold in the usual manner and without involving any difiiculty inavoiding the mutilation of the sand mold.

I claim: 1. The method of forming a mold for the casting of cliainbeiedbodies having an in sert embedded within the wall thereof during thecasting operation, and set in from the faces of such wall, consisting inthe formation of a sand mold conforming to the exterior face of thebody, a core conforming to the interior face thereof but having anaperture conforming in shape and location to the insert, forming a coreblock conforming to such aperture, attaching the insert to the outerface of the block, entering the block into the aperture to bring themargins of the insert in contact with the first mentioned core, fittingthe assembled core elements into the sand mold, and then forcingoutwardly the block to cause the insert to make contact with the sand.

:2. The method of casting chambered bodies comprising previously formedinserts embedded in the cast metal and set in from the face of the body,consisting in forming a send mold of the contour of the exterior of thebody, providing a Core conforming to the interior contour of the eastportion of the body and having an aperture corresponding 5 to thelocation and shape of the insert, inserting into such aperture a Coreblock to which the insert is zi--Xel, placing the assembled HENNINGLOUMAN.

cores Within the sand mold, forcing outwardly the oore block to bringthe ineert into Contact with the sand, and pouring the 10 molten metalinto the completed mold.

In testimony whereof I affix my signature.

